bearing bar for centerless circular grinding
无心圆磨轴承杆
Another choice is a circular bar with a bead that screws on to either end.
另一种选择是一个圆形的酒吧与小珠螺丝要么结束。
Development of automatic welding machine for welding circular seam of kelly bar
方钻杆环缝自动焊机的研制
A Practical Method on the Tower Loading Test and the Stress Measuring of Circular Bar.
塔架负荷试验与圆杆应力测定的实用方法
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